I'm always terrified to see surgical caps and such on doctors in a hospital cafeteria. Also a nurse or surgeon wearing scrubs on public transit. Whether they're coming into work and carrying unknown filth into the facility, or leaving with deadly resistant hospital pathogens on high density transport... they're both terrible. Unless you're outpatient, don't wear scrubs to/from work. Don't be Dr Oz wearing your status on your shirt sleave for giggles while risking patients and public.